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The hilum is a scar on a seed that marks where it was attached to the ovule. In anatomy, the hilum refers to an indentation or opening on a bodily part, similar to a bean's hilum.1

For example, the hilum of the lung is where the bronchi, pulmonary arteries and veins, lymphatic vessels, and nerves enter the organ. Similarly, the hilum of the kidney is the entry and exit point for the renal arteries and veins, lymphatic vessels, nerves, and the ureters.23

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